CN102035740A - Multi-protocol label switching layer-3 virtual private network fast reroute (MPLSL3VPNFRR) method and system - Google Patents
Multi-protocol label switching layer-3 virtual private network fast reroute (MPLSL3VPNFRR) method and system Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L45/00—Routing or path finding of packets in data switching networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
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Abstract
The invention discloses a multi-protocol label switching layer-3 virtual private network fast reroute (MPLSL3VPNFRR) method and system. The method comprises the steps of: when a route is added or updated, adding a special route type label for the route if a three-layer interface to which the route points is configured with FRR (Fast Reroute); and when the FRR is detected to be carried out as required, updating three-layer interface information and target mac (Media Access Control) information, simultaneously configuring an ACL (Access Control List) matching route type label, and redirecting a message matched to a route type label to a new work port. By adopting the method provided in the invention for realizing MPLSL3VPNFRR, the switching time does not depend on the quantity of L3VPN business any more, therefore, the switching time is greatly reduced, and meanwhile, a great amount of hardware resources are saved.
Description
Technical field
The present invention relates to MPLS(Multi-Protocol Label Switching, multiprotocol label switching) technical field, more specifically, relate to a kind of MPLS L3VPN(Lay3 Virtual Private Network, three layer virtual private network) FRR(Fast Reroute, heavy-route fast) method and system.
Background technology
MPLS L3VPN is a kind of based on PE(Provider Edge in service provider's vpn solution) the L3VPN technology, it uses BGP(Border Gateway Protocol, Border Gateway Protocol) issue VPN route on service provider backbone uses MPLS to transmit the VPN message on service provider backbone.
MPLS L3VPN networking mode is flexible, extensibility good, and can support MPLS QoS(Quality of Service, service quality easily) and MPLS TE(Traffic Engineering, traffic engineering), therefore more and more used.
MPLS L3VPN model is made up of following three parts:
CE(Customer Edge) equipment: user network boundary device has the direct and SP(Service Provider of interface, the service provider) link to each other; CE can be equipment or switch, also can be a main frame.CE " perception " does not need to support MPLS less than the existence of VPN yet;
PE(Provider Edge) equipment: Provider Edge equipment is the edge device of service provider network, directly links to each other with user's CE.In the MPLS network, all occur on the PE to all processing of VPN;
P(Provider) equipment: the backbone equipment in the service provider network does not directly link to each other with CE.The P device just will possess basic MPLS transfer capability.
Wherein, the division of CE and PE mainly is the range of management according to SP and user, and CE and PE are the borders of both range of managements.CE equipment is a router normally, when CE with after the PE that directly links to each other sets up syntople, CE is distributed to PE to the VPN route of this website, and acquires the route of far-end VPN from PE.Use the BGP/IGP exchanging routing information between CE and the PE, also can use static routing.
After PE acquires the VPN routing iinformation of CE this locality from CE, by BGP and other PE switched vpc N routing iinformation.Pe router is only safeguarded the routing iinformation of the VPN that directly links to each other with it, all the VPN routes in the not maintenance service provider network.
The P router only is maintained into the route of PE, does not need to understand any VPN routing iinformation.
When transmission VPN flow on the MPLS backbone network, entry PE enters the mouth as Ingress() LSR(Label Switch Router, LSR), outlet PE exports as Egress() LSR, the P router is then as transmitting for Transit() LSR.
Forwarding reliability based on MPLS L3VPN service message; on PE equipment, need to set up MPLS L3VPN FRR; particularly; play two three layer interfaces above the physical port respectively at two; be equipped with main three layer interfaces of three layer interfaces protection; when main three layer interface down(disconnect), all relevant L3VPN business (route that has thousands of even up to ten thousand) need switch to the protection path from operating path and get on, thereby realize the defencive function to MPLS L3VPN business.
Fig. 1 is a networking schematic diagram that the quick heavy-route of typical MPLS L3VPN is used.The service message of coming in from CE equipment need arrive PE2 by PE1, and two paths are arranged: operating path PE1-〉P1-〉P3-〉PE2 and protection path P E1-〉P2-〉PE2.When detecting operating path problem is arranged, PE1 need switch to P2 with service message.
Fig. 2 is the up processing of PE equipment MPLS L3VPN, ASIC(Application Specific Integrated Circuit has been described, application-specific integrated circuit (ASIC)) handling process of the L3VPN of chip promptly obtains next redirect photos and sending messages by route querying and transmits.Wherein, access control list (ACL) can be revised forwarding information again.
Fig. 3 shows traditional MPLS L3VPN FRR and switches, when traditional MPLS L3VPN FRR switches, at first create active and standby two next jump, when needs switched, route was carried out next and is jumped to switch and finish switching one by one.
In sum, in the prior art, the ASIC exchange chip is finished when all relevant L3VPN are professional to be switched, often need one by one route to switch, the clauses and subclauses of switching time and route are directly proportional, thereby when route entry is many, can't satisfy requirement switching time of 50ms.
Summary of the invention
The technical problem that the present invention solves provides a kind of multi-protocol label switching three-layer private virtual net fast rerouting method and system, and it doesn't matter to make the clauses and subclauses of the professional FRR of MPLS L3VPN and route, thereby realize switching fast.
For solving the problems of the technologies described above, the invention provides a kind of multi-protocol label switching three-layer private virtual net fast rerouting method, comprising:
When interpolation or renewal route,, then be that described route is added specific route-type sign if three layer interfaces that described route is pointed to have disposed quick heavy-route (FRR);
When detecting to carry out FRR the time, upgrade three layer interface information and purpose media interviews control (mac) information, access control list (ACL) is set simultaneously mates described route-type sign, and the message redirecting that will match the route-type sign is to new working port.
Further, described three layer interface information comprise: VLAN (vlan) information, source mac information and tunnel label information;
Described renewal three layer interface information are that next jumps all three layer interfaces of index point with three layer interfaces that routing table is pointed to are updated to all business on the tunnel.
Further, described renewal purpose mac information is that next jumps all purpose mac of index point with the purpose mac that routing table is pointed to is updated to all business on the tunnel.
Further, described specific route-type sign is corresponding one by one with described three layer interfaces.
Further, the value of described specific route-type sign is a non-zero;
If described three layer interfaces are not provided with FRR, then its route-type sign is set to 0.
The present invention also provides the quick heavy-route of a kind of multi-protocol label switching three-layer private virtual net system, and described system comprises:
Route is added and update module, when being used for interpolation or upgrading route, if three layer interfaces that described route is pointed to have disposed FRR, then is that described route is added specific route-type sign;
The FRR processing module is used to detect in the time of need carrying out FRR, upgrades three layer interface information and purpose mac information, ACL is set simultaneously mates described route-type sign, and the message redirecting that will match the route-type sign is to new working port.
Described FRR processing module is further used for, when upgrading three layer interface unit, three layer interfaces that routing table is pointed to be updated to all business on the tunnel next jump all three layer interfaces of index point;
Wherein, described three layer interface information comprise: vlan information, source mac information and tunnel label information.
Described FRR processing module is further used for, when upgrading purpose mac unit, the purpose mac that routing table is pointed to be updated to all business on the tunnel next jump all purpose mac of index point.
Further, described route is added and update module also is used for, and the described specific route-type sign of interpolation is corresponding one by one with described three layer interfaces.
Further, described route is added and update module also is used for, and the value of the described specific route-type sign of interpolation is a non-zero;
If described three layer interfaces are not provided with FRR, then its route-type sign is set to 0.
Compared with prior art, the present invention proposes the method for a kind of MPLS of realization L3VPN FRR, be no longer dependent on the quantity of L3VPN business switching time, thereby reduced switching time widely, saved a large amount of hardware resources simultaneously, saved cost.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the networking schematic diagram of MPLS L3VPN FRR;
Fig. 2 is the up processing schematic diagram of PE equipment MPLS L3VPN;
Fig. 3 is the MPLS L3VPN FRR of conventional art
Fig. 4 is the refinement schematic diagram of next hop information;
Fig. 5 is the process chart that the route of the embodiment of the invention is added or upgraded;
Fig. 6 is the professional FRR flow chart of the MPLS L3VPN of the embodiment of the invention.
Embodiment
Main design of the present invention is as follows:
Referring to the refinement diagram of next hop information among Fig. 4, transmit next hop information and mainly comprise two parts: first is an outbound port information; Second portion comprises DMAC(purpose mac) information, pseudo line tag information and three layer interface information.But when MPLS L3VPN FRR, transmit the next skip list item and have only 3 places to need to change in fact: 1, physics outbound port information; 2, three layer interface information comprise vlan(Virtual Local Area Network, VLAN) ID, source mac(Media Access Control, media interviews control), tunnel label information (being the outer MPLS label among Fig. 4); 3, purpose mac information.
Wherein, purpose mac information, three layer interface information are that all professional corresponding next jumpings of forwarding index same multiplexing list item above three layer interfaces, can directly revise, and irrelevant with number of routes; But each next jumping of the outbound port informational needs of each next jumping is revised one by one.
For solving the problem that above-mentioned outbound port can't be multiplexing, core concept of the present invention is: when adding route, if three layer interfaces have disposed FRR, so just give the specific route-type sign of this route assignment, when needs switch, revise the three layer interface information that the inside is delivered in next redirect, purpose mac information, the specific route-type sign of ACL coupling is simultaneously carried out action and is revised outbound port information and get final product, and it doesn't matter thereby make switching time and route entry.
Based on above design, the invention provides a kind of MPLS L3VPN FRR method, mainly comprise the steps:
Step 1. when adding route,, then be the specific route-type sign of this route assignment if three layer interfaces have disposed FRR;
Particularly, can configured tunneling technique above one three layer interface, the tunnel can the configuration protection tunnel; form the protecting tunnel group; a protecting tunnel group needs a route-type sign, and therefore, all routes of going out from particular tunnel protection group have same route-type sign.
Step 2. when protocol detection is carried out the FRR switching to needs, only need to upgrade following information:
1, the corresponding route-type sign of ACL coupling, and carry out action: redirection message is to new working port;
After the routing forwarding, ACL can revise forwarding information, and all messages through these forwarding informations all can be modified port, therefore, only needs to upgrade an acl entry and just can.
2, upgrade three layer interface information, comprise vlan information, source mac information and tunnel label information;
Because jump all can this three layer interface of index point for next of all business above the tunnel, so as long as upgrade one three layer interface information and the number of services above the tunnel is irrelevant.
3, upgrade purpose mac information;
Because next of all business jumped all this purpose of index point mac above the tunnel, therefore, also only need to upgrade a list item and get final product.
For the ease of setting forth the present invention, technical solution of the present invention is described further below with reference to drawings and the specific embodiments.Need to prove that under the situation of not conflicting, embodiment among the application and the feature among the embodiment be combination in any mutually.
Fig. 5 shows the route interpolation of the embodiment of the invention or the handling process of upgrading, and as shown in Figure 5, this flow process specifically describes as follows:
Step a carries out route interpolation or renewal;
Step b judges three layer interfaces and whether has disposed quick heavy-route, if, execution in step c then, otherwise, execution in step d;
Step c is provided with route-type and is masked as specific value, and this specific value is the value of non-zero;
Wherein, described specific value is corresponding one by one with three layer interfaces of FRR, and like this, ACL just can mate corresponding route-type sign according to FRR;
Steps d if do not dispose FRR, then is provided with route-type and is masked as 0, to come with above-mentioned specific route-type sign difference.
As shown in Figure 6, the professional FRR flow process of the MPLS L3VPN of the embodiment of the invention specifically describes as follows:
Step 1 is upgraded three layer interface information;
Wherein, upgrade the three layer interface index list items that all professional next jumpings are pointed on the tunnel, in this step, only need list item of operation.
Step 2 is the purpose mac information of new next-hop device with the DMAC information updating of Dmac index point;
Wherein, the purpose mac information of new next-hop device be all business above the tunnel next jump all purpose mac of index point.Therefore, only need list item of operation.
Step 3 is provided with ACL coupling route-type sign, is redirected to new working port;
As described in the text, in this step, only need to upgrade an acl rule.
Specifically using example below with reference to the present invention is described in more detail the present invention program's enforcement.
In conjunction with Fig. 1, suppose that CE equipment enters the PE1 switch 10 L3VPN examples is arranged, each L3VPN example the inside has 1000 to jump route, operating path is: PE1-〉P1-〉P3-〉PE2, and the protection path is: PE1-〉P2-〉PE2.PE1 switch chassis mac is: 0x0000.0000.00AA, P1 switch chassis mac is: 0x0000.0000.0011, P2 switch chassis mac is: 0x0000.0000.0022.Three layer interface vlan 100 between PE1 and the P1, PE1 connectivity port 2, P1 is 10 to the tunnel label that PE1 distributes; Three layer interface vlan 200 between PE1 and the P2, PE1 connectivity port 3, P2 is 20 to the tunnel label that PE1 distributes.The pseudo line tag information of every route be by bgp protocol at PE1, issue each L3VPN example difference (supposition bgp protocol realize the every label of every example) between the PE2.Vlan 100 and vlan 200 have formed the FRR group.
Then, the up route interpolation flow process of PE1 equipment specifically describes as follows:
Step 110 is added specific one and is jumped route, points to next jumping separately, and outbound port is 2, and vlan is 100, and source mac is 0000.0000.00AA, and tunnel label is 10, and pseudo line tag is the pseudo line tag of the example that belongs to of route for this reason, and specifies the type code 1 of this route.
When protocol detection when needs carry out L3VPN FRR, then carry out following steps 120-140:
Step 120 is provided with ACL coupling route-type sign 1, and execution work is redirected to port 3.
Step 130 is upgraded the three layer interface index list items that all professional next jumpings are pointed to above the tunnel, and vlan is revised as 200, and tunnel label is revised as 20.
Step 140 is upgraded the purpose mac index list item that all professional next jumpings are pointed to above the tunnel, and mac is revised as 0x0000.0000.0022 from 0x0000.0000.0011 with purpose.
In addition, also provide the quick heavy-route of a kind of multi-protocol label switching three-layer private virtual net system in the embodiment of the invention, this system mainly comprises:
Route is added and update module, when being used for interpolation or upgrading route, if three layer interfaces that described route is pointed to have disposed FRR, then is that described route is added specific route-type sign;
The FRR processing module is used to detect in the time of need carrying out FRR, upgrades three layer interface information and purpose mac information, ACL is set simultaneously mates described route-type sign, and the message redirecting that will match the route-type sign is to new working port.
Described FRR processing module is further used for, when upgrading three layer interface unit, three layer interfaces that routing table is pointed to be updated to all business on the tunnel next jump all three layer interfaces of index point;
Wherein, described three layer interface information comprise: vlan information, source mac information and tunnel label information.
Described FRR processing module is further used for, when upgrading purpose mac unit, the purpose mac that routing table is pointed to be updated to all business on the tunnel next jump all purpose mac of index point.
Further, described route is added and update module also is used for, and the described specific route-type sign of interpolation is corresponding one by one with described three layer interfaces.
Further, described route is added and update module also is used for, and the value of the described specific route-type sign of interpolation is a non-zero;
If described three layer interfaces are not provided with FRR, then its route-type sign is set to 0.
It below only is preferred case study on implementation of the present invention; be not limited to the present invention; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Claims (10)
1. a multi-protocol label switching three-layer private virtual net fast rerouting method is characterized in that,
When interpolation or renewal route,, then be that described route is added specific route-type sign if three layer interfaces that described route is pointed to have disposed quick heavy-route (FRR);
When detecting to carry out FRR the time, upgrade three layer interface information and purpose media interviews control (mac) information, access control list (ACL) is set simultaneously mates described route-type sign, and the message redirecting that will match the route-type sign is to new working port.
2. the method for claim 1 is characterized in that,
Described three layer interface information comprise: VLAN (vlan) information, source mac information and tunnel label information;
Described renewal three layer interface information are that next jumps all three layer interfaces of index point with three layer interfaces that routing table is pointed to are updated to all business on the tunnel.
3. the method for claim 1 is characterized in that,
Described renewal purpose mac information is that next jumps all purpose mac of index point with the purpose mac that routing table is pointed to is updated to all business on the tunnel.
4. the method for claim 1 is characterized in that,
Described specific route-type sign is corresponding one by one with described three layer interfaces.
5. as claim 1 or 4 described methods, it is characterized in that,
The value of described specific route-type sign is a non-zero;
If described three layer interfaces are not provided with FRR, then its route-type sign is set to 0.
6. the quick heavy-route of multi-protocol label switching three-layer private virtual net system is characterized in that described system comprises:
Route is added and update module, when being used for interpolation or upgrading route, if three layer interfaces that described route is pointed to have disposed FRR, then is that described route is added specific route-type sign;
The FRR processing module is used to detect in the time of need carrying out FRR, upgrades three layer interface information and purpose mac information, ACL is set simultaneously mates described route-type sign, and the message redirecting that will match the route-type sign is to new working port.
7. system as claimed in claim 6 is characterized in that,
Described FRR processing module is further used for, when upgrading three layer interface unit, three layer interfaces that routing table is pointed to be updated to all business on the tunnel next jump all three layer interfaces of index point;
Wherein, described three layer interface information comprise: vlan information, source mac information and tunnel label information.
8. system as claimed in claim 6 is characterized in that,
Described FRR processing module is further used for, when upgrading purpose mac unit, the purpose mac that routing table is pointed to be updated to all business on the tunnel next jump all purpose mac of index point.
9. as claim 6,7 or 8 described systems, it is characterized in that,
Described route is added and update module also is used for, and the described specific route-type sign of interpolation is corresponding one by one with described three layer interfaces.
10. system as claimed in claim 9 is characterized in that,
Described route is added and update module also is used for, and the value of the described specific route-type sign of interpolation is a non-zero;
If described three layer interfaces are not provided with FRR, then its route-type sign is set to 0.
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| CN201010594041.XA CN102035740B (en) | 2010-12-17 | 2010-12-17 | Multi-protocol label switching three-layer private virtual net fast rerouting method and system |
| PCT/CN2011/077413 WO2012079368A1 (en) | 2010-12-17 | 2011-07-21 | Method and system for multiprotocol label switching layer-three virtual private network fast reroute |
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Also Published As
| Publication number | Publication date |
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| WO2012079368A1 (en) | 2012-06-21 |
| CN102035740B (en) | 2015-09-16 |
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